When I operate the rear quarter window, there is a grinding noise. Took the whole assembly out and the cable was twisted up on the pulley, and it appears that it is stretched too. Got it the cable untwisted and everything back together, and it worked fine the first couple times up and down. Then started making the same noise. Is the cable part of the motor if I was to buy a new motor, or is it a separate part? The motor seems to work fine. I have also heard that adjusting the window afterwards is not an easy task. Any insight would be appreciated.